BacteriaGram-Negative BacteriaGram-Positive BacteriaBacteria, AnaerobicRNA, Ribosomal, 16SMolecular Sequence DataPhylogenyDNA, BacterialBacteria, AerobicBacterial ProteinsDNA, RibosomalSequence Analysis, DNAEscherichia coliWater MicrobiologySoil MicrobiologySeawaterEcosystemBacterial Physiological PhenomenaGram-Negative Aerobic BacteriaRNA, BacterialGram-Negative Anaerobic BacteriaBase SequenceAnti-Bacterial AgentsColony Count, MicrobialBiodiversityGenes, BacterialAmino Acid SequenceGene Expression Regulation, BacterialSulfur-Reducing BacteriaSpecies SpecificityFresh WaterCulture MediaSymbiosisGenes, rRNAGenome, BacterialAnaerobiosisGeologic SedimentsBase CompositionBiodegradation, EnvironmentalPopulation DensityRNA, MessengerBacterial AdhesionPseudomonasEnterobacteriaceaeGammaproteobacteriaArchaeaProteobacteriaPolymerase Chain ReactionBetaproteobacteriaBacteriological TechniquesMetagenomeBiofilmsCloning, MolecularTemperatureFermentationAerobiosisMutationBacteroidesBiotaMicrobial Sensitivity TestsBacterial InfectionsBacterial Typing TechniquesPseudomonas aeruginosaCytophagaOxidation-ReductionFungiPopulation DynamicsHydrogen-Ion ConcentrationStaphylococcus aureusFatty AcidsPlasmidsVibrioSequence Homology, Amino AcidMicrobial ViabilityStreptococcusFecesVirulencePlanktonTreesSequence AlignmentModels, BiologicalBacterial LoadMarine BiologyBacillusCluster AnalysisIntestinesSeasonsGastrointestinal TractProteomeBacteroidetesTranscription, GeneticBiomassPhenotypeActinobacteriaSalmonella typhimuriumMethaneDNA PrimersNucleic Acid HybridizationTime FactorsMass Spectrometry